The F-1015 Precision Single-Mode Fiber Coupler uses a steering lens to achieve 0.1 micron resolution in a compact package. This coupler is very easy to use. An input iris assists in centering the laser beam. The beam passes through a steering lens, which is mounted in a precision X-Y translation assembly with 100 pitch adjustment screws. An objective lens focuses the beam on the fiber core. Translating the steering lens causes a second-order translation of the focused beam across the fiber end-face, providing 0.1 micron beam positioning resolution with negligible changes of incident angle at the fiber face. For use with free-space laser, operating in the visible wavelength range, the F-1015 has a steering lens with a multilayer dielectric AR coating and a M-20X Microscope Objective. The effective focal length is 9 mm. This coupler is constructed of anodized aluminum and are sold without fiber chucks. The FPH-J four-jaw fiber chuck with Teflon liner for fibers less than 250 microns in diameter, and the FPH-DJ Delrin-jawed chuck for fibers 250 microns to 1 mm in diameter are the bare fiber chucks of preference. The FPH-S and FPH-S-2.5 slotted fiber chucks can also be used.